Lock



Oct. 8, 1 929. ogus 1,730,662

LOCK

Filed April 9, 1 928 2 Sheets-Sheet l 1A4 T as iiifi 2* H E. KUbLZS Patented Oct. 8, 1929 UNITED STATES PATENT OFFICE BRONISLAW KOBUS, OF MILWAUKEE, WISCONSIN Look Application filed April 9,

allow the bolt to move either outwardly or inwardly, and in addition to this to so con struct the locking tumblers that they must be ,raised only a predetermined amount and if {raised to a greater height, will lock the .15 plunger against retraction.

Further objects are to provide a lock which is readily removable from the door and may be secured to the inner face of the door, which ;is adapted to receive interchangeable key plates held in contact with the door so that any one of a plurality of different keys may be employed by merely changing the interchangeable key plate.

Further objects are to provide an integral case removably secured to a front cover plate,

and to so construct this front cover plate that it may be removably attached to the inner face of the door. I

An embodiment of the invention is shown in the accompanying drawings in which Figure 1 is a face view of the lock; Figure 2 is a longitudinal sectional view; Figure 3 is a transverse sectional view; Figure 4 is a view of one of the idler tumv blers, showing a portion of the locking bolt;

Figure 5 is a view of the lock with the cover plate and the outermost member removed;

Figure 6 is a view of the lock with the cover plate removed, a part of the lock being in section;

Figure 7 is a view of the lock with the cover plate removed and with all of the locking and idler tumblers removed, the auxiliary tumbler alone being shown associated with the bolt.

Referring to the drawings, it will be seen that the lock comprises an integral case 1 within which a bolt 2 is adapted to slide. This bolt is provided with a longitudinally extending body portion 3 provided with a pair of spaced holes 4 into either one of which a 1928. SeriaiNo. 268,721.

tongue 5 carried by an auxiliary tumbler6 may project to thus hold the bolt either in extended or retracted position. This auxiliary tumbler is urged downwardly by means of a spring 7 (see Figure 7 secured to the case. A transverse pin 8 is positioned above the body portion 3 of the bolt to prevent it from moving upwardly, as may be seen from Figure 7.

This bolt is guided by the projecting portion 2 which passes through a slot or opening in the front face of the casing 1, as shown in Figure 7, and in addition, is guided not only by the pin 8, but also by an elongated slot 9 cooperating with a pivot pin 10 carried by the 7 case. 7

The pivot pin 10 also carries a plurality of tumblers. One series of these tumblers is indicated by the reference character 11 in Figure 4, and this series is the idler series of tumblers. The other series of tumblers, namely the locking tumblers, is indicated by the reference character 12 (see Figure 5). The locking tumblers 12 are provided with a curved lowerface 13 against which the projecting tongues of the key 14 are adapted to contact when the key is turned to thus raise the locking tumblers a predetermined amount.

Further, the idler tumblers 11 are provided with a cut-out 15 below which otherprojecting fingers-of the key are adapted to move. Obviously, if the .idler tumblers are moved upwardly, they will lock, as they are provided with a reces's within which a pin or tongue 16 is located. This tongue is adapted to enter the slot 17 of a transversely projecting arm 18 integral with the body portion 3 of the bolt, as shown most clearly in Figures 8 and 4. These idler tumblers are also provided with a slot 19 within which the arm 18 of the bolt normally slides.

The locking tumblers are. each provided with a pin or lip 20 (see Figure 5) which enters the slot 17 of the bar 18 of the bolt when these locking tumblers are raised by an improperkey, and when the bolt is in the position shown in Figure 5. Thus, these locking tumblers prevent retraction of the bolt unless they are raised only a predetermined amount.

If they are not raised at all, retraction of the undersurfaceof the'body portion 3 bolt is prevented by the tongues 21 carried by overhanging arms 22 of the lockin tumblers. These locking tumblers are also provided with a cut-out rear portion 23 which receives the arm 18 of the bolt when the bolt is retracted, as shown in Figure 6.

Each of the locking and idler tumblers are urged downwardly by means of small springs 24 (see Figure 6) which are carried within a small housing 25 removably mounted within the main case 1 of the lock. The lower ends of each of these springs is secured to a transverse pin 26 carried within the small housing 25.

From the description thus far given, it is apparent that the lockingtumblers must be raised only apredetermined amount as, for example, illustrated in Figure 3, to provide a clear passageway for the arm 18 ofthe bolt between the tongues 20 and 21. If they are raised, either a greater or a lesser amount, the tongue cannot pass and consequently the bolt cannot be retracted.

In addition to these locking and idler tumblers, a fixed member 27 (see Figure 6) is provided. This member 27 is provided with a. square aperture which receives the squared endlO of the pivot pin 10 for all of the tumblers. After all of the tumblers are positioned, including the fixed member 27, a washer 28 is positioned against the end ofthe pin and is locked in place by means of a screw 29, .as

shown in Figure 6.

It is to be noted that the cut-out portions 13 of thelocking tumblers and the cut-out portions 15 of the idler tumblers are located at different heights with reference to the centering pin 30 of the key, so that only one type of key may be employed for operating the lock. The key is provided with a relatively heavy projecting tongue 31 (see Figure 3) which fits within the notch 32 formed in the of the bolt, as shown in Figure 7, and thus as the key is'tiirned, it urges the bolt either inwardly or outwardly.

"T he look is provided with a removable face plate 33 (see-Figures land 2) which is provided with a plurality of holes 34k through which screws may be passed to secure the lock to a door. Thereafter the case 1 is positioned as shown in Figure 2. This positioning of the case is easily accomplished as the plate "33is provided with a plurality of tongues 34 adjacent its rear end which fit within apertures35formed in the case 1. Thereafter the case 1 is rocked into position and screws 36 are passed through the front face of the case and into lugs 37 carried by the inner side of the face plate 33, to thus lock the case to the face plate.

The face plate 33 is provided with a rectangular cut out portion havinginset shoul' .ders 38. Thls rectangular cut-out portion re ceives interchangeable key plates v39 which are held in place by means of screws 40. These key plates may have different configurations so as to accommodate different types of keys. For example, the key plate illustrated in Figure 1 shows a projecting tongue 41 which extends into the key hole slot 42 and consequently requires the use of a key having a slot extending longitudinally thereof and located in a position to accommodate this tongue or lip.

if desired, the lockmay be equipped with a night bolt 43 operated by means of a thumbpiece 44.

It istobe noted vparticularly that a very sturdy and relatively simple type of lock has been providedin which lockingtumblers and idler tumblers are employed, and which cooperate with a boltto lockthebolt in either projected or retracted position.

Further, it will be seen that if the idler tumblers are raised while the bolt is proj ected, the bolt cannot be retracted.

Further. if the lockingtumblers are raised while the bolt is projected, they may release the bolt provided they are raised only apredetermined amount. If raised a greater amount by an improper key, for instance, they will lock the bolt against retraction.

Although the invention has, been described in considerable detail, such description is intended as illustrative rather than limiting as the invention may be variously embodied and as the scope of such invention is to be. determined as claimed.

1 claim:

1. In a key operatedlock, the combination of a casing, a bolt slidably carried thereby, a pivot pin carried by said casing, a plurality of locking tumblers and idler tumblers pivotally carried by said pin and each having,a slotted portion, a transverse slotted arm rigidlycarried by said bolt and adapted toslide inthe slotted portion of said tumblers, said locking tumblers having notches for the reception of said arm when said bolt is in retracted position, said locking tumblers having .oneseries of projections adapted toenter the slot in said arm when said bolt is proj ected. from the lock and having a second set of projections opposite said first mentioned setand adapted to enter said slot when saiddocking tumblers are removed beyond a predetermined point .and said bolt is extended, said idler tumblers having notches adapted. to, receivesaidaarm when said bolt is extended and said. .idler.. tumblers are moved from their normalposipivot pin carried by said casing, aplurality of locking tumblers and idler tumblerspivotally carried by said pin and eaclrhaving a slotted portion, a transverse slotted arm rigidlycarried by said bolt-and adapted to. slidefinthe slotted portion of said tumblers, said locking tumblers having notches for the reception of said arm when said bolt is in retracted position, said locking tumblers havingv one series of projections adapted to enter the slot in said arm When said bolt is projected from the lock and-having a second set of projections opposite said first mentioned set and adapted to enter said slot when said locking tumblers are moved beyond a predetermined point and said bolt is extended, said idler tumblers having notches adapted to receive said arm when said bolt is extended and said idler tumblers are moved from their normal position, and a series of springs carried within said casing and attached to the free ends of said idler and looking tumblers.

3. In a key operated lock, the combination of a casing, a bolt slidably carried thereby, a

pivot pin carried by said casing, a plurality of locking tumblers and idler tumblers pivotally carried by said pin and each having a slotted portion, a transverse slotted arm rigidly carried by said bolt and adapted to slide in the slotted portion of said tumblers, said lockin tumblers having notches for the reception 0? said arm when said bolt is in retracted position, said locking tumblers'having one series of projections adapted to enter the slot in said arm when said bolt is projected from the lock and having a second set of projections opposite said first mentioned set and adapted to enter said slot when said locking tumblers are moved beyond a predetermined point and said bolt is extended, said idler tumblers having projections adapted to enter the slot in said arm when said bolt is extended and said idler tumblers are moved from their normal position, and a series of springs carried'within said casing and attached to the free ends of said idler and looking tumblers. I

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wisconsin. V

BRONISLAW KOBUS. 

